Walgalu is the language of the Ngambri - Ngurmal peoples. Other spellings for these two groups include Kamberri and Gurmal. The data for Walgalu language are scarce. Walgalu's relationship to other languages is reported variously in the sources: Based on his analysis of pronouns, Koch describes Walgalu as a dialect of the same language as Ngarigu S46 and the Canberra language D62 (2011:19).
Clark describes a 'language continuum' encompassing Walgalu, Yaithmathang S43, Ngarigu and the Canberra language D62 (2009:219).
Wafer and Lissarrague indicate that Walgalu is related to the Canberra language D62 and Ngarigu; they call it the western dialect of Ngarigu (2008:107). Wesson (2000) describes Walgalu as one of three closely related dialects, the others being Ngarigo and Ngunawal D3.
Flood appears to treat Wolgal (S47) as the name of a people whose language is Ngarigo S46 (1984).
From Jingellic eastward was the country of the Walgalu tribe, whose speech resembled partly the Dhudhuroa and partly the Dyirringan, a tongue spoken from about Nimmitabel to Bega (Blake and Reid 2002:179). Headwaters of the Murrumbidgee, and Tumut rivers; at Kiandra; south to Tintaldra; northeast to near Queanbeyan (Tindale 1974). To the north of the Ngarigo were the Wolgal, who extended over the great alpine ranges in which the Murray and the Murrumbidgee rise (Howitt 1904:102). The Wolgal lived on the tablelands of the highest of the Australian Alps, and in the country falling from them to the north. The boundaries of their country commenced at Kauwambat near to the Pilot Mountain, following the Indi River to Walleregang, thence to the starting-point, Kauwambat, by Tumberumba, Tumut, Queenbean, Cooma, and the Great Dividing Range (Howitt 1904:78). The Kurnai tribe carries us to the border of New South Wales, and the Wolgal, who extended down the Upper Murray to near Albury (Howitt 1904:81).
Speaker numbers were measured differently across the censuses and various other sources listed in AUSTLANG. You are encouraged to refer to the sources.
Speaker numbers for ‘NILS 2004’ and ‘2005 estimate’ come from 'Table F.3: Numbers of speakers of Australian Indigenous languages (various surveys)' in 'Appendix F NILS endangerment and absolute number results' in McConvell, Marmion and McNicol 2005, pages 198-230 (PDF, 2.5MB).